Thomas edwin twist



T. E. TWIST; MOLD.

(No Model.)

atented Feb. 3,1891.

WIT-N ESSES FFICE.

PATENT THOMAS EDWIN TWIST, OF MILTON, PENNSYLVANIA.

MOLD.

SPECIFICATION forming part of Letters Patent No. 445,737, dated February3, 1891.

Application filed November 6,1890. Serial No. 370,530. (No model.)

To aZZ whom it may concern:

Be it known that I, THOMAS EDWIN Twrsr, a citizen of the United States,residing at Milton, in the county of Northumberland and State ofPennsylvania, have invented certain new and useful Improvements in theMannfacture of Chairs for Railroad-Rails; and I do hereby declare the hfollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My inventionrelates to the manufacture of chairs for railroad-rails; andthe object of the invention is to provide improved means by which anumber of chairs may be cast or formed at a single operation.

To this end my invention consists of the improvements hereinafterdescribed, and particularly pointed out in the claims at the end of thisspecification.

In the drawings, Figure 1 represents the upper section or cope of anordinary flaskinverted, showing the mold after the withdrawal of thepattern and the chill in position; and Fig. 2 is a perspective view ofmy improved combination-chill.

The letter A in Fig. 1 represents the cope or upper section of anordinary flask inverted, the drag or lower section of the flask beingremoved, and B B the matrices or cavities in the mold for forming aseries of chairs at a single operation.

0 represents the chill, which is preferably a cast-iron cruciformstructure, having several arms 0 a united to a main body portion, whichis recessed at c c to form the head or upper portion of the chair. Theseseveral arms each terminate in a projecting rib or flange 0 which formsa recess in the casting, havingalip which overlaps the web of the railwhich fits into the socket formed by said recess and lip in the mannerindicated by the arms of the chill, as shown in Fig. 1; but the numberof arms of the chill and the general arrangement of the parts may bemodified in an obvious mannerwithoutdeparting from the spirit of myinvention, and although I preferably use a chill having pairs ofoppositelyextending arms, as shown in the drawings, it is apparent thatsimilar advantages would result if the chill had a greater or lessnumber of arms, it being necessary, however, to use at least three arms,so as to cause the same to support each other and prevent displacementof the chill in the process of molding.

In the construction shown in Fig. 1 the pattern used for forming themold resembles in general outline the figure for-med by the severalmatrices B 13, together with the solid cruciform structure 0representing the chill and having the triangular portions or Wingsrepresented by the letters I) b, which connect the web and flange of thechair so as to form the supporting braces or flanges of the same, andalso the strips or braces represented by the cavities d d, which formthe gateways or channels leading from the sprue to the several matrices.

It is manifest that the pattern may be varied according to the shape ofthe chair to be produced and the number it is desired to form at oneoperation Without departing from the essential features of myinvention;butI have found the cruciform structure of pattern and chill the mostconvenient in practice, and preferably use a pattern and chill of thedescribed construction for the purpose of manufacturing chairs of thetype illustrated in Patent No. 366,545, dated July 12, 1887; but ofcourse my invention is not limited to the manufacture of chairs of anyspecific type.

By this invention it will be seen that a num ber of chairs may be formedin a single operation and in a simple and effective manner as comparedwith methods of production heretofore in use.

I am aware that in the manufacture of chairs for railroad-rails variouscontrivances have heretofore been devised for the purpose of moldingchairs, and it has been proposed to mold more than one chair at a singleoperation; but in all such contrivances it has been found in practicethat in pouring the metal into the molds the chill would often either beoverturned or thrust to one side or the other of the mold, so that theoperation has either been a total failure or the finished article hasvaried in width and thickness, differing essentially from the patternand so unevenly formed as to render the same unfit for use, renderingthe process of manufacture tedious and expensive by reason of the lossof time and material resulting from a frequent failure in practice toproduce the desired results,

and it is the object of my invention to overcome these difficulties byproviding an appachill, as has been necessary with devices heretofore inuse.

Having therefore described my invention, I claim as new and desire tosecure by Letters Patent 1. In the manufacture of chairs :forrailroad-rails, the combination of the flask, the mold, and the chill,which consists of a main body portion provided with three 01' more arms,which extend laterally therefrom and are adapted to form the recesses orseats for N the rails in the upper portions of the chairs,

substantially as described.

2. In the manufacture of chairs for railroad-rails, the combination ofthe flask, the mold, and the chill, which consists of a main portionrecessed to form the heads of the chairs and having pairs ofoppositely-extending arms which terminate in ribs or flanges adapted toform sockets to receive the Web of the rail, substantially as described.

3. In the manufacture of chairs for railroad-rails, a cross-shapedchill-core having its main body portion provided with recesses to formthe heads of the chairs and having arms which terminate in ribs orflanges adapted to form sockets to receive the Web of the rail,substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

THOMAS EDWIN TWIST.

Witnesses:

GEO. STRAYER, J os. ANGSTADT.

